Supercells are the mightiest of the thunderstorms. They can roll for hours while maintaining tornadoes and damaging hail.

A storm system produced multiple tornadoes ... Trees were snapped, along with power lines, leaving hundreds in the dark. The tornado moved into the Salem area just before 1 p.m. WAPT Chief ...

A supercell thunderstorm, which brought almost hurricane-force straight-line winds, was responsible for a 300-mile swath of damage across northern Maryland and southern Pennsylvania on Saturday ...

A supercell thunderstrom in Oklahoma. Image courtesy of NSSL/NOAA. The National Weather Service defines a severe thunderstorm as a thunderstorm that is producing: Hail that is at least quarter ...

High temperatures, humidity and an approaching cold front are expected to brew up some of the most severe thunderstorms seen in the province so far this year on Tuesday afternoon, according to ...

A supercell, according to the National Weather Service, is the least common type of thunderstorm. The National Weather Service said a supercell has a "high propensity to produce severe weather ...

Pottawattamie, Cass CountiesOne supercell storm produced multiple tornadoes north of Omaha before crossing into Pottawattamie County, Iowa. A spotter reported a possible tornado southeast of ...

A supercell made for an ominous light show in south Oklahoma on Monday, April 28, as a tornado warning and severe thunderstorm alert were in effect in the area. Texas-based storm chaser Chad Casey ...

A supercell storm put on a dazzling light show as it loomed over Bowie, Texas, on Friday night, April 18, This spectacular footage was captured by storm chaser Chad Casey, as the National Weather ...